Lists the folders found in the parent folder.
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
This method lists the folders found in the parent folder. This method populates the Folders property.
Set parentFolderId to be an empty string to list all folders in the root folder.
If the number of folders is greater than the folder page size, ListFoldersMarker will be populated and calling ListFolders again will list the next page of folders.
Example (List All Folders in the Root Folder)